Under jaw slightly projecting beyond the upper : teeth twenty-two to twenty-five on each side above and below; straight, compressed, and rounded at the summits.

D. Phoccena, Desm. Mammal, p. 516. Flem. Brit. An. p. 33. Porpesse, Penn. Brit. Zool. vol. til. p. 69. Shaw, Gen. Zool. vol. 11. p. 504. pi. 229.

Dimensions

Entire length from four feet to five feet and a half. Descript. Body elongated, gradually tapering towards the tail: snout short, rather obtuse at the extremity : under jaw somewhat longer than the upper: teeth numerous; from twenty-two to twenty-five in each jaw on each side, compressed, and nearly straight: eyes small, almost in a line with the mouth: blow-hole crescent-shaped, with the concavity directed forwards: pectoral fins placed low down, oval, and somewhat pointed: dorsal fin straight, triangular, rather beyond the middle of the body. Skin smooth; dusky on the back, whitish on the belly, the two colours meeting on the sides.

A constant inhabitant of the British seas, often entering the mouths of rivers. Preys on mackarel, herrings, and other fish. A specimen which occurred in the London market in May 1833 was found to contain a full-formed foetus; it is probable, therefore, that they produce their young at about that period of the year.